SLIDING PARTS

摘要

Sliding parts of a pair of annular bodies include sealing faces that relatively slide on each other. A reversed Rayleigh step mechanism serving as a negative pressure generation mechanism is provided in at least one of the sealing faces, and a negative pressure generation groove that forms the reversed Rayleigh step mechanism is provided in an arc shape along the circumferential direction of the sealing face so as to be isolated from a high pressure fluid side and a low pressure fluid side by a land section.

主权项

1. Sliding parts of a pair of annular bodies comprising sealing faces that relatively slide on each other, wherein:
a reversed Rayleigh step mechanism serving as a negative pressure generation mechanism is provided in at least one of the sealing faces; a negative pressure generation groove that forms the reversed Rayleigh step mechanism is provided in an arc shape along a circumferential direction of the sealing face so as to be isolated from a high pressure fluid side and a low pressure fluid side by a land section; an upstream side end and a downstream side end of the negative pressure generation groove are isolated from each other by a land section; the downstream side end communicates with the high pressure fluid side via a deep groove; and a ratio x=b/a between circumferential length a of the negative pressure generation groove and circumferential length b of the land section between the upstream side end of the negative pressure generation groove and the deep groove is set to be different in a radial direction.